A disagreement between effective sizes of elementary free volumes found from the four component PATFIT analyses of positronium annihilation lifetime spectra and experiments on low temperature sorption for two membrane materials of internal microporosity poly(tri‐methyl‐silyl‐propyne) PTMSP and spiro‐linked benzodioxane polymer PIM‐1 is described and discussed. This disagreement can be minimized essentially using the fifth lifetime component but not the Gaussian distribution of the fourth component. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Shantarovich et al. (2007) studied this question.
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